Two former Parramatta Eels players are accused of harbouring semi-automatic weapons and possessing more than half-a-million dollars in cash after dramatic arrests in Sydney's Centennial Park yesterday.

Third whale found dead off Qld coast

A third killer whale carcass has been found by wildlife rangers at Fraser Island, off the southern Queensland coast.

The whale was discovered late on Friday in a creek north of Kingfisher Bay on the island by Queensland Parks and Wildlife Service staff.

The discovery comes two days after two whales, believed to be a mother and calf, died on Wednesday when their pod became stranded on a sandbar in the Great Sandy Strait which separates the island from the mainland.

It's believed the whale discovered on Friday, which measures seven metres, had been dead for at least 24 hours before its discovery.

Sea World animal care supervisor Tacha Mulligan says it's unclear why the whales died, though it could be an underlying health problem that's to blame.

"The necropsy performed yesterday on an adult female that died on Wednesday showed it had no food it its stomach and had very little milk in its mammary glands even though it had a young calf with it," Mulligan said in a statement.

"At this point in time, whilst there are no indications of illness amongst the remaining nine whales, it gives us concern that three animals have died in such a short space of time and we will continue to monitor the killer whale's behaviour."

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The remaining nine members of the pod were continuing to be monitored but none of the animals appeared to be in any distress, Ms Mulligan said

"The pod seems to be quite comfortable in their current location and we have even observed some members rolling on their backs and displaying tail lobs which are relaxed and playful behaviours," she said.

"At this point in time we have not seen any indication in the pod's behaviour that gives us cause for concern."

Intervention will only be required if it becomes clear the whales are not able to make their way into open water, the statement said.